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pg_receivexlog
Name
pg_receivexlog—streamtransactionlogsfromaPostgreSQLserver
Synopsis
pg_receivexlog
[
option
...]
Description
pg_receivexlogisusedtostreamtransactionlogfromarunningPostgreSQLcluster.Thetransaction
logis streamedusingthestreamingreplicationprotocol,andiswrittentoalocaldirectoryoffiles.
Thisdirectorycanbeusedasthearchivelocationfordoingarestoreusingpoint-in-timerecovery(see
Section24.3).
pg_receivexlogstreamsthetransactionloginrealtimeasit’sbeinggeneratedontheserver,anddoes
notwaitforsegmentstocompletelikearchive_commanddoes.Forthisreason,itisnotnecessaryto
setarchive_timeoutwhenusingpg_receivexlog.
ThetransactionlogisstreamedoveraregularPostgreSQLconnection,andusesthereplicationproto-
col.Theconnectionmustbemadewithasuperuserorauserhaving
REPLICATION
permissions(see
Section20.2),and
pg_hba.conf
mustexplicitlypermitthereplicationconnection.Theservermust
alsobeconfiguredwithmax_wal_senderssethighenoughtoleaveatleastonesessionavailablefor
thestream.
Iftheconnectionislost,orifitcannotbeinitiallyestablished,withanon-fatalerror,pg_receivexlog
will retry the connectionindefinitely,andreestablish streaming as soon as possible.Toavoid this
behavior,usethe
-n
parameter.
Options
-D
directory
--directory=
directory
Directorytowritetheoutputto.
Thisparameterisrequired.
-n
--no-loop
Don’tlooponconnectionerrors.Instead,exitrightawaywithanerror.
-s
interval
--status-interval=
interval
Specifiesthenumberofsecondsbetweenstatuspacketssentbacktotheserver.Thisallowsfor
easiermonitoringoftheprogressfromserver.Avalueofzerodisablestheperiodicstatusupdates
completely,althoughanupdatewillstillbesentwhenrequestedbytheserver,toavoidtimeout
disconnect.Thedefaultvalueis10seconds.
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pg_receivexlog
-S
slotname
--slot=
slotname
Requirepg_receivexlogtouseanexistingreplicationslot(seeSection25.2.6).Whenthisoption
isused,pg_receivexlogwillreportaflushpositiontotheserver,indicatingwheneachsegment
hasbeensynchronizedtodisksothattheservercanremovethatsegmentifitisnototherwise
needed.When using this parameter,it is important to make sure thatpg_receivexlog cannot
becomethesynchronousstandbythroughanincautioussettingofsynchronous_standby_names;
itdoesnotflushdatafrequentlyenoughforthistoworkcorrectly.
-v
--verbose
Enablesverbosemode.
Thefollowingcommand-lineoptionscontrolthedatabaseconnectionparameters.
-d
connstr
--dbname=
connstr
Specifiesparametersusedtoconnecttotheserver,asaconnectionstring.SeeSection31.1.1for
moreinformation.
The option is called
--dbname
for consistency with other client applications, but because
pg_receivexlogdoesn’tconnecttoanyparticulardatabaseinthe cluster,databasenameinthe
connectionstringwillbeignored.
-h
host
--host=
host
Specifiesthehostnameofthemachineonwhichtheserverisrunning.Ifthevaluebeginswith
aslash,itis usedas the directoryforthe Unixdomain socket.The defaultis takenfromthe
PGHOST
environmentvariable,ifset,elseaUnixdomainsocketconnectionisattempted.
-p
port
--port=
port
SpecifiestheTCPportorlocalUnixdomainsocketfileextensiononwhichtheserverislistening
forconnections.Defaultstothe
PGPORT
environmentvariable,ifset,oracompiled-indefault.
-U
username
--username=
username
Usernametoconnectas.
-w
--no-password
Neverissueapasswordprompt.Iftheserverrequires passwordauthenticationandapassword
isnot availablebyothermeans suchasa
.pgpass
file,theconnectionattemptwillfail.This
optioncanbeusefulinbatchjobsandscriptswherenouserispresenttoenterapassword.
-W
--password
Forcepg_receivexlogtopromptforapasswordbeforeconnectingtoadatabase.
Thisoptionisneveressential,sincepg_receivexlogwillautomaticallypromptforapasswordif
theserverdemandspasswordauthentication.However,pg_receivexlogwillwasteaconnection
attemptfindingoutthattheserverwantsapassword.Insomecasesitisworthtyping
-W
toavoid
theextraconnectionattempt.
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pg_receivexlog
Otheroptionsarealsoavailable:
-V
--version
Printthepg_receivexlogversionandexit.
-?
--help
Showhelpaboutpg_receivexlogcommandlinearguments,andexit.
Environment
Thisutility,likemostotherPostgreSQLutilities,usestheenvironmentvariablessupportedbylibpq
(seeSection31.14).
Notes
When using pg_receivexlog insteadof archive_commandas the main WAL backup method, it is
strongly recommendedtouse replication slots. Otherwise,the server is free to recycle or remove
transactionlogfilesbeforetheyarebackedup,becauseitdoesnothaveanyinformation,eitherfrom
archive_commandorthereplicationslots,abouthowfarthe WALstreamhasbeenarchived.Note,
however,thatareplicationslotwillfilluptheserver’sdiskspaceifthereceiverdoesnotkeepupwith
fetchingtheWALdata.
Examples
To streamthe transaction log fromthe server at
mydbserver
and store it in the local directory
/usr/local/pgsql/archive
:
$ pg_receivexlog -h mydbserver -D /usr/local/pgsql/archive
See Also
pg_basebackup
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pg_recvlogical
Name
pg_recvlogical—controlPostgreSQLlogicaldecodingstreams
Synopsis
pg_recvlogical
[
option
...]
Description
pg_recvlogical
controlslogicaldecodingreplicationslotsandstreamsdatafromsuchreplication
slots.
Itcreates areplication-modeconnection,soitis subjecttothesameconstraintsas pg_receivexlog,
plusthoseforlogicalreplication(seeChapter46).
Options
Atleastoneofthefollowingoptionsmustbespecifiedtoselectanaction:
--create-slot
Createanewlogicalreplicationslotwiththenamespecifiedby
--slot
,usingtheoutputplugin
specifiedby
--plugin
,forthedatabasespecifiedby
--dbname
.
--drop-slot
Dropthereplicationslotwiththenamespecifiedby
--slot
,thenexit.
--start
Beginstreamingchangesfromthelogicalreplicationslotspecifiedby
--slot
,continuinguntil
terminatedbyasignal.Iftheserversidechangestreamendswithaservershutdownordiscon-
nect,retryinaloopunless
--no-loop
isspecified.
Thestreamformatisdeterminedbytheoutputpluginspecifiedwhentheslotwascreated.
Theconnectionmustbetothesamedatabaseusedtocreatetheslot.
--create-slot
and
--start
canbespecifiedtogether.
--drop-slot
cannotbecombinedwith
anotheraction.
Thefollowingcommand-lineoptionscontrolthelocationandformatoftheoutputandotherreplica-
tionbehavior:
-f
filename
--file=
filename
Writereceivedanddecodedtransactiondataintothisfile.Use
-
forstdout.
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pg_recvlogical
-F
interval_seconds
--fsync-interval=
interval_seconds
Specifieshowoftenpg_recvlogicalshouldissue
fsync()
callstoensuretheoutputfileissafely
flushedtodisk.
Theserverwilloccasionallyrequesttheclienttoperformaflushandreporttheflushpositionto
theserver.Thissettingisinadditiontothat,toperformflushesmorefrequently.
Specifying an interval of
0
disables issuing
fsync()
calls altogether, while still reporting
progresstotheserver.Inthiscase,datacouldbelostintheeventofacrash.
-I
lsn
--startpos=
lsn
In
--start
mode,startreplicationfromthegivenLSN.Fordetailsontheeffectofthis,seethe
documentationinChapter46andSection49.3.Ignoredinothermodes.
-n
--no-loop
Whentheconnectiontotheserverislost,donotretryinaloop,justexit.
-o
name
[=
value
]
--option=
name
[=
value
]
Pass theoption
name
tothe outputplugin with,if specified,theoptionvalue
value
. Which
optionsexistandtheireffectsdependsontheusedoutputplugin.
-P
plugin
--plugin=
plugin
When creatinga slot,use the specified logical decodingoutputplugin.See Chapter46.This
optionhasnoeffectiftheslotalreadyexists.
-s
interval_seconds
--status-interval=
interval_seconds
This optionhasthesameeffectastheoptionofthesamenameinpg_receivexlog.Seethede-
scriptionthere.
-S
slot_name
--slot=
slot_name
In
--start
mode, use the existing logical replication slot named
slot_name
. In
--create-slot
mode,createtheslotwiththisname.In
--drop-slot
mode,deletetheslot
withthisname.
-v
--verbose
Enablesverbosemode.
Thefollowingcommand-lineoptionscontrolthedatabaseconnectionparameters.
-d
database
--dbname=
database
Thedatabasetoconnectto.Seethedescriptionoftheactionsforwhatthismeansindetail.This
canbealibpqconnectionstring;seeSection31.1.1formoreinformation.Defaultstousername.
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pg_recvlogical
-h
hostname-or-ip
--host=
hostname-or-ip
Specifiesthehostnameofthemachineonwhichtheserverisrunning.Ifthevaluebeginswith
aslash,itis usedas the directoryforthe Unixdomain socket.The defaultis takenfromthe
PGHOST
environmentvariable,ifset,elseaUnixdomainsocketconnectionisattempted.
-p
port
--port=
port
SpecifiestheTCPportorlocalUnixdomainsocketfileextensiononwhichtheserverislistening
forconnections.Defaultstothe
PGPORT
environmentvariable,ifset,oracompiled-indefault.
-U
user
--username=
user
Usernametoconnectas.Defaultstocurrentoperatingsystemusername.
-w
--no-password
Neverissueapasswordprompt.Iftheserverrequires passwordauthenticationandapassword
isnot availablebyothermeans suchasa
.pgpass
file,theconnectionattemptwillfail.This
optioncanbeusefulinbatchjobsandscriptswherenouserispresenttoenterapassword.
-W
--password
Forcepg_recvlogicaltopromptforapasswordbeforeconnectingtoadatabase.
Thisoptionisneveressential,sincepg_recvlogicalwillautomaticallypromptforapasswordif
theserverdemandspasswordauthentication.However,pg_recvlogicalwillwasteaconnection
attemptfindingoutthattheserverwantsapassword.Insomecasesitisworthtyping
-W
toavoid
theextraconnectionattempt.
Thefollowingadditionaloptionsareavailable:
-V
--version
Printthepg_recvlogicalversionandexit.
-?
--help
Showhelpaboutpg_recvlogicalcommandlinearguments,andexit.
Environment
Thisutility,likemostotherPostgreSQLutilities,usestheenvironmentvariablessupportedbylibpq
(seeSection31.14).
Examples
SeeSection46.1foranexample.
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pg_recvlogical
See Also
pg_receivexlog
1694
pg_restore
Name
pg_restore—restoreaPostgreSQLdatabasefromanarchivefilecreatedbypg_dump
Synopsis
pg_restore
[
connection-option
...][
option
...][
filename
]
Description
pg_restoreis autilityforrestoringaPostgreSQLdatabasefromanarchivecreatedbypg_dumpin
oneofthenon-plain-textformats.Itwillissuethecommandsnecessarytoreconstructthedatabaseto
thestateitwasinatthetimeitwassaved.Thearchivefilesalsoallowpg_restoretobeselectiveabout
whatisrestored,oreventoreordertheitemspriortobeingrestored.Thearchivefilesaredesignedto
beportableacrossarchitectures.
pg_restorecan operate in twomodes.Ifa database name is specified,pg_restore connects tothat
databaseandrestoresarchivecontentsdirectlyintothedatabase.Otherwise,ascriptcontainingthe
SQLcommandsnecessarytorebuildthedatabaseiscreatedandwrittentoafileorstandardoutput.
This script output is equivalent to the plain text output formatof pg_dump.Some of the options
controllingtheoutputarethereforeanalogoustopg_dumpoptions.
Obviously,pg_restorecannotrestoreinformationthatisnotpresentinthearchivefile.Forinstance,
ifthearchivewasmadeusingthe“dumpdataas
INSERT
commands”option,pg_restorewillnotbe
abletoloadthedatausing
COPY
statements.
Options
pg_restoreacceptsthefollowingcommandlinearguments.
filename
Specifiesthelocationofthearchivefile(ordirectory,foradirectory-formatarchive)tobere-
stored.Ifnotspecified,thestandardinputisused.
-a
--data-only
Restoreonlythedata,nottheschema(datadefinitions).Tabledata,largeobjects,andsequence
valuesarerestored,ifpresentinthearchive.
Thisoptionissimilarto,butforhistoricalreasonsnotidenticalto,specifying
--section=data
.
-c
--clean
Clean(drop)databaseobjectsbeforerecreatingthem.(Unless
--if-exists
isused,thismight
generate some harmless error messages, if any objects were not present in the destination
database.)
1695
pg_restore
-C
--create
Createthedatabasebeforerestoringintoit.If
--clean
isalsospecified,dropandrecreatethe
targetdatabasebeforeconnectingtoit.
When this optionis used,the databasenamed with
-d
is usedonly to issuethe initial
DROP
DATABASE
and
CREATE DATABASE
commands.Alldataisrestoredintothedatabasenamethat
appearsinthearchive.
-d
dbname
--dbname=
dbname
Connecttodatabase
dbname
andrestoredirectlyintothedatabase.
-e
--exit-on-error
ExitifanerrorisencounteredwhilesendingSQLcommandstothedatabase.Thedefaultisto
continueandtodisplayacountoferrorsattheendoftherestoration.
-f
filename
--file=
filename
Specify output file for generatedscript,or forthe listing when usedwith
-l
.Default is the
standardoutput.
-F
format
--format=
format
Specifyformatofthe archive.It is not necessarytospecifytheformat,since pg_restorewill
determinetheformatautomatically.Ifspecified,itcanbeoneofthefollowing:
c
custom
Thearchiveisinthecustomformatofpg_dump.
d
directory
Thearchiveisadirectoryarchive.
t
tar
Thearchiveisa
tar
archive.
-i
--ignore-version
Adeprecatedoptionthatisnowignored.
-I
index
--index=
index
Restore definitionof named indexonly.Multiple indexes may be specified withmultiple
-I
switches.
1696
pg_restore
-j
number-of-jobs
--jobs=
number-of-jobs
Runthemosttime-consumingpartsofpg_restore—thosewhichloaddata,createindexes,or
createconstraints —usingmultipleconcurrentjobs.This optioncan dramatically reduce the
timetorestorealargedatabasetoaserverrunningonamultiprocessormachine.
Eachjobisoneprocessoronethread,dependingontheoperatingsystem,anduses aseparate
connectiontotheserver.
The optimal valuefor this option depends onthe hardwaresetupoftheserver,ofthe client,
andofthenetwork.FactorsincludethenumberofCPUcoresandthedisksetup.Agoodplace
tostartisthenumberofCPUcoresonthe server,butvalues largerthanthatcanalsoleadto
fasterrestore times in many cases.Of course,values thataretoohighwill lead to decreased
performancebecauseofthrashing.
Onlythecustomanddirectoryarchiveformatsaresupportedwiththisoption.Theinputmustbe
aregularfileordirectory(not,forexample,apipe).Thisoptionisignoredwhenemittingascript
ratherthanconnectingdirectlytoadatabaseserver.Also,multiplejobscannotbeusedtogether
withtheoption
--single-transaction
.
-l
--list
Listthecontentsofthearchive.Theoutputofthisoperationcanbeusedasinputtothe
-L
option.
Notethatiffilteringswitchessuchas
-n
or
-t
areusedwith
-l
,theywillrestricttheitemslisted.
-L
list-file
--use-list=
list-file
Restoreonlythosearchiveelementsthatarelistedin
list-file
,andrestorethemintheorder
theyappearinthefile.Notethatiffilteringswitchessuchas
-n
or
-t
areusedwith
-L
,theywill
furtherrestricttheitemsrestored.
list-file
isnormallycreatedbyeditingtheoutputofaprevious
-l
operation.Linescanbe
movedorremoved,andcanalsobecommentedoutbyplacingasemicolon(
;
)atthestartofthe
line.Seebelowforexamples.
-n
namespace
--schema=
schema
Restoreonly objects thatare in the namedschema.Multiple schemas may bespecifiedwith
multiple
-n
switches.Thiscanbecombinedwiththe
-t
optiontorestorejustaspecifictable.
-O
--no-owner
Donotoutputcommandstosetownershipofobjectstomatchtheoriginaldatabase.Bydefault,
pg_restoreissues
ALTER OWNER
or
SET SESSION AUTHORIZATION
statements tosetowner-
shipofcreatedschemaelements.Thesestatements willfailunlesstheinitialconnectiontothe
databaseismadebyasuperuser(orthesameuserthatownsalloftheobjectsinthescript).With
-O
,anyusernamecanbeusedfortheinitialconnection,andthisuserwillownallthecreated
objects.
-P
function-name(argtype [, ...])
--function=
function-name(argtype [, ...])
Restorethenamedfunctiononly.Becarefultospellthefunctionnameandargumentsexactly
as theyappearinthedumpfile’s table ofcontents.Multiplefunctions maybespecifiedwith
multiple
-P
switches.
1697
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